From 63a4ecea93e278eeaa5de23d774d4dee06d9c4fa Mon Sep 17 00:00:00 2001
From: Friedemann Kleint <Friedemann.Kleint@qt.io>
Date: Mon, 19 Aug 2019 16:01:05 +0200
Subject: TextEditor: Add modified handling

Add a modified property to the document and add
handling in onClosing(). Connect the actions to
call close() instead of Qt.quit() for it to
become active.

Change-Id: I0fec75629db64e91508ed8ba45d4fb60be146b1b
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
---
 .../quickcontrols2/texteditor/documenthandler.cpp     | 15 +++++++++++++++
 examples/quickcontrols2/texteditor/documenthandler.h  |  7 +++++++
 examples/quickcontrols2/texteditor/qml/texteditor.qml | 19 +++++++++++++++++--
 3 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/examples/quickcontrols2/texteditor/documenthandler.cpp b/examples/quickcontrols2/texteditor/documenthandler.cpp
index 25a83592..5def1b61 100644
--- a/examples/quickcontrols2/texteditor/documenthandler.cpp
+++ b/examples/quickcontrols2/texteditor/documenthandler.cpp
@@ -80,7 +80,11 @@ void DocumentHandler::setDocument(QQuickTextDocument *document)
     if (document == m_document)
         return;
 
+    if (m_document)
+        m_document->textDocument()->disconnect(this);
     m_document = document;
+    if (m_document)
+        connect(m_document->textDocument(), &QTextDocument::modificationChanged, this, &DocumentHandler::modifiedChanged);
     emit documentChanged();
 }
 
@@ -370,3 +374,14 @@ void DocumentHandler::mergeFormatOnWordOrSelection(const QTextCharFormat &format
         cursor.select(QTextCursor::WordUnderCursor);
     cursor.mergeCharFormat(format);
 }
+
+bool DocumentHandler::modified() const
+{
+    return m_document && m_document->textDocument()->isModified();
+}
+
+void DocumentHandler::setModified(bool m)
+{
+    if (m_document)
+        m_document->textDocument()->setModified(m);
+}
diff --git a/examples/quickcontrols2/texteditor/documenthandler.h b/examples/quickcontrols2/texteditor/documenthandler.h
index a6125bc3..97e55658 100644
--- a/examples/quickcontrols2/texteditor/documenthandler.h
+++ b/examples/quickcontrols2/texteditor/documenthandler.h
@@ -84,6 +84,8 @@ class DocumentHandler : public QObject
     Q_PROPERTY(QString fileType READ fileType NOTIFY fileUrlChanged)
     Q_PROPERTY(QUrl fileUrl READ fileUrl NOTIFY fileUrlChanged)
 
+    Q_PROPERTY(bool modified READ modified WRITE setModified NOTIFY modifiedChanged)
+
 public:
     explicit DocumentHandler(QObject *parent = nullptr);
 
@@ -124,6 +126,9 @@ public:
     QString fileType() const;
     QUrl fileUrl() const;
 
+    bool modified() const;
+    void setModified(bool m);
+
 public Q_SLOTS:
     void load(const QUrl &fileUrl);
     void saveAs(const QUrl &fileUrl);
@@ -150,6 +155,8 @@ Q_SIGNALS:
     void loaded(const QString &text);
     void error(const QString &message);
 
+    void modifiedChanged();
+
 private:
     void reset();
     QTextCursor textCursor() const;
diff --git a/examples/quickcontrols2/texteditor/qml/texteditor.qml b/examples/quickcontrols2/texteditor/qml/texteditor.qml
index a1cb3435..6c95335b 100644
--- a/examples/quickcontrols2/texteditor/qml/texteditor.qml
+++ b/examples/quickcontrols2/texteditor/qml/texteditor.qml
@@ -80,7 +80,7 @@ ApplicationWindow {
     }
     Shortcut {
         sequence: StandardKey.Quit
-        onActivated: Qt.quit()
+        onActivated: close()
     }
     Shortcut {
         sequence: StandardKey.Copy
@@ -121,7 +121,7 @@ ApplicationWindow {
             }
             MenuItem {
                 text: qsTr("&Quit")
-                onTriggered: Qt.quit()
+                onTriggered: close()
             }
         }
 
@@ -205,6 +205,14 @@ ApplicationWindow {
         id: errorDialog
     }
 
+    MessageDialog {
+        id : quitDialog
+        title: qsTr("Quit?")
+        text: qsTr("The file has been modified. Quit anyway?")
+        buttons: (MessageDialog.Yes | MessageDialog.No)
+        onYesClicked: Qt.quit()
+    }
+
     header: ToolBar {
         leftPadding: 8
 
@@ -449,4 +457,11 @@ ApplicationWindow {
             onTriggered: colorDialog.open()
         }
     }
+
+    onClosing: {
+        if (document.modified) {
+            quitDialog.open()
+            close.accepted = false
+        }
+    }
 }
-- 
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